摘要
采用碰撞的方法可解决压电悬臂梁的固有频率与外部输入频率不匹配问题,从而提高能量收集的效率。该文讨论了附加质量块的结构及碰撞接触面的设计,对不同接触面进行力学分析,并制作和装配了两种不同接触面的实验原型装置,通过外接电阻来测试输出功率。实验结果表明,在相同的外部输入下,非对称接触面设计的附加质量块可增大反向行程时压电梁的变形,与对称接触面相比,其输出功率可提高约23%。
Impact-excited piezoelectric cantilever power harvester has been found as an effective approach for solving the mismatch between the resonant frequency and input frequency.The structure design of the proof mass is discussed and the discussion focused on the impulsive contact surface design in this paper.Modeling and dynamic analysis of different contact surface are performed.Two-centimeter scale prototype harvesters which consist of different tip form are fabricated and tested.The measured powers with variable external resistance under different walking speed of each prototype are compared.For the piezoelectric cantilever with asymmetric contact surface,the output maximum average power is 23% more than the power generated by the piezoelectric bimorph cantilever with symmetric contact surface under the same condition.
出处
《压电与声光》
CSCD
北大核心
2015年第5期760-763,共4页
Piezoelectrics & Acoustooptics
基金
深圳科创委基金资助项目(JCYJ 20120617140557216
JCYJ20120613133924264)
关键词
压电能量收集
碰撞
悬臂梁
接触面
建模
piezoelectric power harvesting
impact-excited
cantilever beam
contact surface
modeling
